US20190369323A1 - Display device - Google Patents
Display device Download PDFInfo
- Publication number
- US20190369323A1 US20190369323A1 US16/427,360 US201916427360A US2019369323A1 US 20190369323 A1 US20190369323 A1 US 20190369323A1 US 201916427360 A US201916427360 A US 201916427360A US 2019369323 A1 US2019369323 A1 US 2019369323A1
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- United States
- Prior art keywords
- light
- guide plate
- microstructures
- light guide
- light source
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- 239000010408 film Substances 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
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- 230000003287 optical effect Effects 0.000 description 1
Images
Classifications
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0075—Arrangements of multiple light guides
- G02B6/0076—Stacked arrangements of multiple light guides of the same or different cross-sectional area
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- G—PHYSICS
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- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
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- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
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- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
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- G02F1/1333—Constructional arrangements; Manufacturing methods
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
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- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133601—Illuminating devices for spatial active dimming
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- G—PHYSICS
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133626—Illuminating devices providing two modes of illumination, e.g. day-night
-
- G02F2001/133626—
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/02—Composition of display devices
- G09G2300/023—Display panel composed of stacked panels
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- G—PHYSICS
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/066—Adjustment of display parameters for control of contrast
Definitions
- the invention relates to an optical device, and more particularly to a display device.
- a liquid crystal display panel of a liquid crystal display device does not emit light, so a surface light source needs to be provided by a backlight module.
- the backlight module includes a direct type backlight module and a side-edge backlight module.
- a current common direct type backlight module is to dispose a plurality of LEDs arranged in a two-dimensional array under a diffusion plate.
- the direct type backlight module has better brightness uniformity, there is a problem of thick thickness.
- the current side-edge backlight module has a thinner thickness than the direct type backlight module because a LED strip is disposed on a side of a light guide plate.
- the invention provides a display device, which can improve the contrast of an image.
- a display device in an embodiment of the invention includes a display panel and a backlight module.
- the display panel is disposed on a light exiting side of the backlight module.
- the display panel includes a first display mode and a second display mode.
- the display panel displays a first light transmissive pattern in the first display mode, and the display panel displays a second light transmissive pattern in the second display mode.
- the backlight module includes a first light guide plate, a second light guide plate, a first light source and a second light source.
- the first light guide plate has a first light incident surface, a first light exiting surface and a first bottom surface adjacent to the first light incident surface, and a plurality of first microstructures.
- the first microstructures are disposed on at least one of the first light exiting surface and the first bottom surface, and a distributed region of the first microstructures corresponds to the first light transmissive pattern.
- the second light guide plate is stacked on the first light guide plate, and has a second light incident surface, a second light exiting surface and a second bottom surface adjacent to the second light incident surface, and a plurality of second microstructures.
- the second microstructures are disposed on at least one of the second light exiting surface and the second bottom surface, and a distributed region of the second microstructures corresponds to the second light transmissive pattern.
- the first light source is disposed adjacent to the first light incident surface, and is configured to emit a first light beam into the first light guide plate, and the first light beam is emerged from the first light guide plate through the first microstructures.
- the second light source is disposed adjacent to the second light incident surface, and is configured to emit a second light beam into the second light guide plate, and the second light beam is emerged from the second light guide plate through the second microstructures.
- the distributed region of the first microstructures of the first light guide plate corresponds to the first light transmissive pattern
- the distributed region of the second microstructures of the second light guide plate corresponds to the second light transmissive pattern.
- FIG. 1 is a schematic cross-sectional view of a display device of one embodiment of the invention.
- FIG. 2A is a schematic diagram of a display device in a first display mode in accordance with one embodiment of the invention.
- FIG. 2B is a schematic diagram of a display device in a second display mode in accordance with one embodiment of the invention.
- FIG. 3A and FIG. 3B are schematic diagrams showing distributions of first microstructures of another embodiment of the invention.
- FIG. 4 is a schematic cross-sectional view of a display device of another embodiment of the invention.
- FIG. 5A is a schematic diagram of a display device in a first display mode in accordance with another embodiment of the invention.
- FIG. 5B is a schematic diagram of a display device in a second display mode in accordance with another embodiment of the invention.
- FIG. 5C is a schematic diagram of a display device in a third display mode in accordance with another embodiment of the invention.
- the description of “A” component facing “B” component herein may contain the situations that “A” component facing “B” component directly or one or more additional components is between “A” component and “B” component.
- the description of “A” component “adjacent to” “B” component herein may contain the situations that “A” component is directly “adjacent to” “B” component or one or more additional components is between “A” component and “B” component. Accordingly, the drawings and descriptions will be regarded as illustrative in nature and not as restrictive.
- FIG. 1 is a schematic cross-sectional view of a display device of one embodiment of the invention.
- FIG. 2A is a schematic diagram of a display device in a first display mode in accordance with one embodiment of the invention.
- FIG. 2B is a schematic diagram of a display device in a second display mode in accordance with one embodiment of the invention.
- the display device 10 of the embodiment includes a display panel 100 and a backlight module 200 .
- the display panel 100 is disposed on a light exiting side of the backlight module 200 .
- the display panel 100 includes, for example, a first display mode and a second display mode.
- the backlight module 200 includes a first light guide plate 210 , a second light guide plate 220 , a first light source 230 and a second light source 240 .
- the first light guide plate 210 has a first light incident surface 211 , a first light exiting surface 212 and a first bottom surface 213 adjacent to the first light incident surface 211 , and a plurality of first microstructures 214 .
- the first microstructures 214 are, for example, distributed on the first bottom surface 213 of the first light guide plate 210 .
- the second light guide plate 220 is stacked on the first light guide plate 210 , and has a second light incident surface 221 , a second light exiting surface 222 and a second bottom surface 223 adjacent to the second light incident surface 221 , and a plurality of second microstructures 224 .
- the second microstructures 224 are, for example, distributed on the second bottom surface 223 of the second light guide plate 220 .
- the first light guide plate 210 is, for example, disposed between the second light guide plate 220 and the display panel 100 , but is not limited thereto.
- the second light guide plate 220 may also be disposed between the first light guide plate 210 and the display panel 100 .
- the first light source 230 is disposed adjacent to the first light incident surface 211 , and is configured to emit a first light beam L 1 into the first light guide plate 210 through the first light incident surface 211 , and the first light beam L 1 is emerged from the first light guide plate 210 through the first microstructures 214 .
- the second light source 240 is disposed adjacent to the second light incident surface 221 , and is configured to emit a second light beam L 2 into the second light guide plate 220 through the second light incident surface 221 , and the second light beam L 2 is emerged from the second light guide plate 220 through the second microstructures 224 .
- the invention does not particularly limit the pattern of the microstructures, as long as the function to transmit light out of the light guide plate can be achieved.
- a microstructure having a planar reflecting surface or a curved reflecting surface.
- the display panel 100 displays, for example, a first light transmissive pattern 101 in the first display mode (as shown in FIG. 2A ), and the shape and position of a distributed region 215 of the first microstructures 214 correspond to the first light transmissive pattern 101 .
- the display panel 100 displays, for example, a second light transmissive pattern 102 in the second display mode (as shown in FIG. 2B ), and the shape and position of a distributed region 225 of the second microstructures 224 correspond to the second light transmissive pattern 102 .
- the first light transmissive pattern 101 and the second light transmissive pattern 102 may be two patterns separated from each other on the display panel 100 , or may be two patterns partially overlapping on the display panel 100 , and are not limited thereto.
- the first light transmissive pattern 101 is a plurality of circles having different sizes
- the second light transmissive pattern 102 is a rectangle, but not limited thereto.
- the first light transmissive pattern 101 and the second light transmissive pattern 102 may be any shape, or may be displayed in a single area of the display panel 100 or divided into a plurality of areas.
- the first light transmissive pattern 101 and the second light transmissive pattern 102 may, for example, have partial overlap.
- the distributed region 215 of the microstructures 214 on the first light guide plate 210 and the distributed region 225 of the microstructures 224 on the second light guide plate 220 respectively correspond to the areas of the first light transmissive pattern 101 and the second light transmissive pattern 102 . Therefore, the distributed region 215 where the first microstructures 214 are distributed and the distributed region 225 where the second microstructures 224 are distributed also have partial overlap.
- the correspondence between the microstructures and the light transmissive pattern will be exemplified by the first light guide plate 210 and the display panel 100 .
- the display panel 100 displays the first light transmissive pattern 101 .
- the first light source 230 emits the first light beam L 1 into the first light guide plate 210 , and the first light beam L 1 is emerged from the first light guide plate 210 through the first microstructures 214 and is transmitted to the display panel 100 . Since the shape and position of a distributed region 215 of the first microstructures 214 correspond to the first light transmissive pattern 101 , a light shape of the first light beam L 1 emitted from the first light guide plate 210 can be the same as the shape of the first light transmissive pattern 101 .
- the first light beam L 1 is irradiated to the first light transmissive pattern 101 , since the light shape of the first light beam L 1 is the same as the shape of the first light transmissive pattern 101 , the first light beam L 1 is concentratedly irradiated on the first light transmissive pattern 101 to improve the brightness of the first light transmissive pattern 101 , and the situation that the first light beam L 1 is irradiated on the area of the display panel 100 that is not the first light transmissive pattern 101 can be reduced to reduce a light leakage of the display area other than the first light transmissive pattern.
- the display panel 100 displays the second light transmissive pattern 102 .
- the second light source 240 emits the second light beam L 2 into the second light guide plate 220 , and the second light beam L 2 is emerged from the second light guide plate 220 through the second microstructures 224 and is transmitted to the display panel 100 . Since the shape and position of a distributed region 225 of the second microstructures 224 correspond to the second light transmissive pattern 102 , a light shape of the second light beam L 2 emitted from the second light guide plate 220 can be the same as the shape of the second light transmissive pattern 102 .
- the second light beam L 2 is irradiated to the second light transmissive pattern 102 , since the light shape of the second light beam L 2 is the same as the shape of the second light transmissive pattern 102 , the second light beam L 2 is concentratedly irradiated on the second light transmissive pattern 102 to improve the brightness of the second light transmissive pattern 102 , and the situation that the second light beam L 2 is irradiated on the area of the display panel 100 that is not the second light transmissive pattern 102 can be reduced to reduce a light leakage of the display area other than the second light transmissive pattern.
- the display device 10 further includes, for example, a control unit 300 electrically connected to the display panel 100 , the first light source 230 , and the second light source 240 .
- the control unit 300 controls to turn on the first light source 230 and turn off the second light source 240 to irradiate the first light beam L 1 to the first light transmissive pattern 101 through the distributed region 215 of the first microstructures 214 .
- the control unit 300 controls to turn off the first light source 230 and turn on the second light source 240 to irradiate the second light beam L 2 to the second light transmissive pattern 102 through the distributed region 225 of the second microstructures 224 .
- the display panel 100 is, for example, a liquid crystal display panel or other non-self-luminous display panel.
- the display panel 100 can include a plurality of display modes according to design requirements.
- the display panel 100 of the embodiment is exemplified by the first display mode and the second display mode, but is not limited thereto.
- the display panel 100 may also include three display modes or more, that is, the first display mode, the second display mode, and the third display mode or more.
- the first light source 230 and the second light source 240 are, for example, strip light sources including a plurality of point light sources, wherein the point light sources are, for example, light emitting diodes (LEDs), but not limited thereto.
- the first light source 230 and the second light source 240 may also be other kinds of strip light sources, such as light tubes, and the invention does not limit the type of the light source.
- the backlight module 200 further includes, for example, a reflective sheet 250 disposed on a side of the second light guide plate 220 away from the first light guide plate 210 to reflect a light leaking from below the first light guide plate 210 and the second light guide plate 220 back into the first light guide plate 210 and the second light guide plate 220 , thereby to improve light utilization efficiency.
- the backlight module 200 may further include at least one optical film 260 , for example, two films (optical films 261 , 262 ).
- the optical film 260 is, for example, a diffusion film or a brightness enhancement film, and is disposed between the display panel 100 and the first light guide plate 210 to improve the light brightness and the light uniformity of the backlight module 200 , and the like.
- the distributed region 215 of the first microstructures 214 of the first light guide plate 210 corresponds to the first light transmissive pattern 101
- the distributed region 225 of the second microstructures 224 of the second light guide plate 220 corresponds to the second light transmissive pattern 102 .
- the contrast of the image of the display device 10 can be improved in both the first display mode and the second display mode, so that the backlight module 200 of the embodiment can also exhibit a high dynamic range (HDR) effect on the display image without using dynamic local dimming.
- HDR high dynamic range
- the quantity of types of the display modes needs to correspond to the quantity of light guide plates in the backlight module 200 .
- the display panel 100 of the embodiment includes a first display mode and a second display mode.
- the backlight module 200 includes a first light guide plate 210 and a second light guide plate 220 in a design architecture.
- the display panel 100 switches only between the first display mode and the second display mode, that is, only the first light transmissive pattern 101 and the second light transmissive pattern 102 are displayed, and no other display mode is included.
- FIG. 3A and FIG. 3B are schematic diagrams showing distributions of first microstructures of another embodiment of the invention.
- the first microstructures 214 are, for example, distributed on the first bottom surface 213 of the first light guide plate 210 , but are not limited thereto.
- the first microstructures 214 may also be distributed on the first light exiting surface 212 of the first light guide plate 210 a, or may be simultaneously distributed on the first bottom surface 213 of the first light guide plate 210 b and the first light exiting surface 212 of the first light guide plate 210 b , as shown in FIG. 3B .
- the positions where the second microstructures 224 may be distributed on the second light guide plate 220 are the same as that of the first microstructures 214 , it will not be described again herein. However, in one embodiment, distribution positions of the second microstructures 224 on the second light guide plate 220 and distribution positions of the first microstructures 214 on the first light guide plate 210 may be different. For example, the second microstructures 224 are distributed on the second bottom surface 223 , and the first microstructures 214 are distributed on the first light exiting surface 212 . The distribution of the first microstructures 214 and the second microstructures 224 can be adjusted according to design requirements.
- FIG. 4 is a schematic cross-sectional view of a display device of another embodiment of the invention.
- FIG. 5A is a schematic diagram of a display device in a first display mode in accordance with another embodiment of the invention.
- FIG. 5B is a schematic diagram of a display device in a second display mode in accordance with another embodiment of the invention.
- FIG. 5C is a schematic diagram of a display device in a third display mode in accordance with another embodiment of the invention.
- the display device 10 a of the embodiment is similar in structure and advantages to the display device 10 . The only difference is that the display panel 100 a of the embodiment further includes a third display mode.
- the display panel 100 a displays a third light transmissive pattern 103 in the third display mode.
- the backlight module 200 a further includes a third light guide plate 270 and a third light source 280 .
- the third light guide plate 270 is stacked on the first light guide plate 210 and the second light guide plate 220 .
- the first light guide plate 210 is, for example, disposed between the second light guide plate 220 and the display panel 100
- the third light guide plate 270 is, for example, disposed on a side of the second light guide plate 220 away from the first light guide plate 210 , but is not limited thereto.
- the third light guide plate 270 has a third light incident surface 271 , a third light exiting surface 272 and a third bottom surface 273 adjacent to the third light incident surface 271 , and a plurality of third microstructures 274 .
- the third light source 280 is disposed adjacent to the third light incident surface 271 , and is configured to emit a third light beam L 3 into the third light guide plate 270 , and the third light beam L 3 is emerged from the third light guide plate 270 through the third microstructures 274 .
- the display panel 100 a displays, for example, a third light transmissive pattern 103 in the third display mode (as shown in FIG. 5C ), and the shape and position of a distributed region 275 of the third microstructures 274 correspond to the third light transmissive pattern 103 .
- the third microstructures 274 of the embodiment are, for example, distributed on the third bottom surface 273 of the third light guide plate 270 , but are not limited thereto.
- the positions where the third microstructures 274 may be distributed on the third light guide plate 270 are the same as that of the first microstructures 214 and the second microstructures 224 and will not be described again herein.
- the third light transmissive pattern 103 may also, for example, partially overlap with at least one of the first light transmissive pattern 101 and the second light transmissive pattern 102 .
- the distributed region 275 of the third microstructures 274 may also partially overlap with at least one of the distributed region 215 of the first microstructures 214 and the distributed region 225 of the second microstructures 224 .
- the control unit 300 a may further be electrically connected to the third light source 280 .
- the control unit 300 a controls to turn off the first light source 230 and the second light source 240 and turn on the third light source 280 .
- the shape and the position of the distribution region of the first microstructures of the first light guide plate correspond to the first light transmissive pattern
- the shape and the position of the distribution region of the second microstructures of the second light guide plate correspond to the second light transmissive pattern.
- the contrast of the image of the display device can be improved in both the first display mode and the second display mode, so that the backlight module of the embodiment of the invention can also exhibit a high dynamic range effect on the display image without using dynamic local dimming.
- the terms such as the first display mode, the second display mode, the third display mode, the first light guide plate, the second light guide plate, the third light guide plate, the first light source, the second light source, the third light source, the first light transmissive pattern, the second light transmissive pattern, the third light transmissive pattern, the first light incident surface, the second light incident surface, the third light incident surface, the first light exiting surface, the second light exiting surface, the third light exiting surface, the first bottom surface, the second bottom surface, the third bottom surface, the first microstructures, the second microstructures, the third microstructures, the first light beam, the second light beam and the third light beam are only used for distinguishing various elements and do not limit the number of the elements.
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Abstract
Description
- This application claims the priority benefit of China application CN201810567461.5, filed on 2018 Jun. 5. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.
- The invention relates to an optical device, and more particularly to a display device.
- A liquid crystal display panel of a liquid crystal display device does not emit light, so a surface light source needs to be provided by a backlight module. The backlight module includes a direct type backlight module and a side-edge backlight module. A current common direct type backlight module is to dispose a plurality of LEDs arranged in a two-dimensional array under a diffusion plate. Although the direct type backlight module has better brightness uniformity, there is a problem of thick thickness. The current side-edge backlight module has a thinner thickness than the direct type backlight module because a LED strip is disposed on a side of a light guide plate.
- However, regardless of the direct type backlight module or the side-edge backlight module, there is a problem that a contrast of a display image is not obvious enough. Although it can be improved by a technique of local dimming, the local dimming still cannot completely correspond to a pattern displayed on a display panel, causing light leakage in a non-pattern display area.
- The information disclosed in this “BACKGROUND OF THE INVENTION” section is only for enhancement understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Furthermore, the information disclosed in this “BACKGROUND OF THE INVENTION” section does not mean that one or more problems to be solved by one or more embodiments of the invention were acknowledged by a person of ordinary skill in the art.
- The invention provides a display device, which can improve the contrast of an image.
- Other advantages and objects of the invention may be further illustrated by the technical features broadly embodied and described as follows.
- In order to achieve one or a portion of or all of the objects or other objects, a display device provided in an embodiment of the invention includes a display panel and a backlight module. The display panel is disposed on a light exiting side of the backlight module. The display panel includes a first display mode and a second display mode. The display panel displays a first light transmissive pattern in the first display mode, and the display panel displays a second light transmissive pattern in the second display mode. The backlight module includes a first light guide plate, a second light guide plate, a first light source and a second light source. The first light guide plate has a first light incident surface, a first light exiting surface and a first bottom surface adjacent to the first light incident surface, and a plurality of first microstructures. The first microstructures are disposed on at least one of the first light exiting surface and the first bottom surface, and a distributed region of the first microstructures corresponds to the first light transmissive pattern. The second light guide plate is stacked on the first light guide plate, and has a second light incident surface, a second light exiting surface and a second bottom surface adjacent to the second light incident surface, and a plurality of second microstructures. The second microstructures are disposed on at least one of the second light exiting surface and the second bottom surface, and a distributed region of the second microstructures corresponds to the second light transmissive pattern. The first light source is disposed adjacent to the first light incident surface, and is configured to emit a first light beam into the first light guide plate, and the first light beam is emerged from the first light guide plate through the first microstructures. The second light source is disposed adjacent to the second light incident surface, and is configured to emit a second light beam into the second light guide plate, and the second light beam is emerged from the second light guide plate through the second microstructures.
- In the embodiment of the invention, the distributed region of the first microstructures of the first light guide plate corresponds to the first light transmissive pattern, and the distributed region of the second microstructures of the second light guide plate corresponds to the second light transmissive pattern. When the first light beam is transmitted to the display panel through the first microstructures in the first display mode, a brightness of the first light transmissive pattern is improved, and a light leakage of a display area other than the first light transmissive pattern is reduced. When the second light beam is transmitted to the display panel through the second microstructures in the second display mode, a brightness of the second light transmissive pattern is improved, and a light leakage of a display area other than the second light transmissive pattern is reduced. Therefore, the contrast of the image of the display device can be improved in both the first display mode and the second display mode.
- Other objectives, features and advantages of The invention will be further understood from the further technological features disclosed by the embodiments of The invention wherein there are shown and described preferred embodiments of this invention, simply by way of illustration of modes best suited to carry out the invention.
- The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
-
FIG. 1 is a schematic cross-sectional view of a display device of one embodiment of the invention. -
FIG. 2A is a schematic diagram of a display device in a first display mode in accordance with one embodiment of the invention. -
FIG. 2B is a schematic diagram of a display device in a second display mode in accordance with one embodiment of the invention. -
FIG. 3A andFIG. 3B are schematic diagrams showing distributions of first microstructures of another embodiment of the invention. -
FIG. 4 is a schematic cross-sectional view of a display device of another embodiment of the invention. -
FIG. 5A is a schematic diagram of a display device in a first display mode in accordance with another embodiment of the invention. -
FIG. 5B is a schematic diagram of a display device in a second display mode in accordance with another embodiment of the invention. -
FIG. 5C is a schematic diagram of a display device in a third display mode in accordance with another embodiment of the invention. - In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings which form a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. In this regard, directional terminology, such as “top”, “bottom”, “front”, “back”, etc., is used with reference to the orientation of the Figure(s) being described. The components of the invention can be positioned in a number of different orientations. As such, the directional terminology is used for purposes of illustration and is in no way limiting. On the other hand, the drawings are only schematic and the sizes of components may be exaggerated for clarity. It is to be understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the invention. Also, it is to be understood that the phraseology and terminology used herein are for the purpose of description and should not be regarded as limiting. The use of “including”, “comprising”, or “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Unless limited otherwise, the terms “connected”, “coupled”, and “mounted” and variations thereof herein are used broadly and encompass direct and indirect connections, couplings, and mountings. Similarly, the terms “facing”, “faces”, and variations thereof herein are used broadly and encompass direct and indirect facing, and “adjacent to” and variations thereof herein are used broadly and encompass directly and indirectly “adjacent to”. Therefore, the description of “A” component facing “B” component herein may contain the situations that “A” component facing “B” component directly or one or more additional components is between “A” component and “B” component. Also, the description of “A” component “adjacent to” “B” component herein may contain the situations that “A” component is directly “adjacent to” “B” component or one or more additional components is between “A” component and “B” component. Accordingly, the drawings and descriptions will be regarded as illustrative in nature and not as restrictive.
-
FIG. 1 is a schematic cross-sectional view of a display device of one embodiment of the invention.FIG. 2A is a schematic diagram of a display device in a first display mode in accordance with one embodiment of the invention.FIG. 2B is a schematic diagram of a display device in a second display mode in accordance with one embodiment of the invention. Referring toFIG. 1 ,FIG. 2A andFIG. 2B , thedisplay device 10 of the embodiment includes adisplay panel 100 and abacklight module 200. Thedisplay panel 100 is disposed on a light exiting side of thebacklight module 200. Thedisplay panel 100 includes, for example, a first display mode and a second display mode. Thebacklight module 200 includes a firstlight guide plate 210, a secondlight guide plate 220, a firstlight source 230 and a secondlight source 240. The firstlight guide plate 210 has a firstlight incident surface 211, a firstlight exiting surface 212 and a firstbottom surface 213 adjacent to the firstlight incident surface 211, and a plurality offirst microstructures 214. Thefirst microstructures 214 are, for example, distributed on the firstbottom surface 213 of the firstlight guide plate 210. The secondlight guide plate 220 is stacked on the firstlight guide plate 210, and has a secondlight incident surface 221, a secondlight exiting surface 222 and a secondbottom surface 223 adjacent to the secondlight incident surface 221, and a plurality ofsecond microstructures 224. Thesecond microstructures 224 are, for example, distributed on the secondbottom surface 223 of the secondlight guide plate 220. The firstlight guide plate 210 is, for example, disposed between the secondlight guide plate 220 and thedisplay panel 100, but is not limited thereto. The secondlight guide plate 220 may also be disposed between the firstlight guide plate 210 and thedisplay panel 100. The firstlight source 230 is disposed adjacent to the firstlight incident surface 211, and is configured to emit a first light beam L1 into the firstlight guide plate 210 through the firstlight incident surface 211, and the first light beam L1 is emerged from the firstlight guide plate 210 through thefirst microstructures 214. The secondlight source 240 is disposed adjacent to the secondlight incident surface 221, and is configured to emit a second light beam L2 into the secondlight guide plate 220 through the secondlight incident surface 221, and the second light beam L2 is emerged from the secondlight guide plate 220 through thesecond microstructures 224. In addition, although thefirst microstructures 214 and thesecond microstructures 224 inFIG. 1 are illustrated by concave triangles, the invention does not particularly limit the pattern of the microstructures, as long as the function to transmit light out of the light guide plate can be achieved. For example, a microstructure having a planar reflecting surface or a curved reflecting surface. - The
display panel 100 displays, for example, a firstlight transmissive pattern 101 in the first display mode (as shown inFIG. 2A ), and the shape and position of a distributedregion 215 of thefirst microstructures 214 correspond to the firstlight transmissive pattern 101. Thedisplay panel 100 displays, for example, a secondlight transmissive pattern 102 in the second display mode (as shown inFIG. 2B ), and the shape and position of a distributedregion 225 of thesecond microstructures 224 correspond to the secondlight transmissive pattern 102. The firstlight transmissive pattern 101 and the secondlight transmissive pattern 102 may be two patterns separated from each other on thedisplay panel 100, or may be two patterns partially overlapping on thedisplay panel 100, and are not limited thereto. In the embodiment, the firstlight transmissive pattern 101 is a plurality of circles having different sizes, and the secondlight transmissive pattern 102 is a rectangle, but not limited thereto. The firstlight transmissive pattern 101 and the secondlight transmissive pattern 102 may be any shape, or may be displayed in a single area of thedisplay panel 100 or divided into a plurality of areas. The firstlight transmissive pattern 101 and the secondlight transmissive pattern 102 may, for example, have partial overlap. When the two have a partial overlap, the distributedregion 215 of themicrostructures 214 on the firstlight guide plate 210 and the distributedregion 225 of themicrostructures 224 on the secondlight guide plate 220 respectively correspond to the areas of the firstlight transmissive pattern 101 and the secondlight transmissive pattern 102. Therefore, the distributedregion 215 where thefirst microstructures 214 are distributed and the distributedregion 225 where thesecond microstructures 224 are distributed also have partial overlap. The correspondence between the microstructures and the light transmissive pattern will be exemplified by the firstlight guide plate 210 and thedisplay panel 100. - Referring to
FIG. 1 andFIG. 2A again, when thedisplay panel 100 is switched to the first display mode, thedisplay panel 100 displays the firstlight transmissive pattern 101. The firstlight source 230 emits the first light beam L1 into the firstlight guide plate 210, and the first light beam L1 is emerged from the firstlight guide plate 210 through thefirst microstructures 214 and is transmitted to thedisplay panel 100. Since the shape and position of a distributedregion 215 of thefirst microstructures 214 correspond to the firstlight transmissive pattern 101, a light shape of the first light beam L1 emitted from the firstlight guide plate 210 can be the same as the shape of the firstlight transmissive pattern 101. When the first light beam L1 is irradiated to the firstlight transmissive pattern 101, since the light shape of the first light beam L1 is the same as the shape of the firstlight transmissive pattern 101, the first light beam L1 is concentratedly irradiated on the firstlight transmissive pattern 101 to improve the brightness of the firstlight transmissive pattern 101, and the situation that the first light beam L1 is irradiated on the area of thedisplay panel 100 that is not the firstlight transmissive pattern 101 can be reduced to reduce a light leakage of the display area other than the first light transmissive pattern. - Referring to
FIG. 1 andFIG. 2B again, as described above, when thedisplay panel 100 is switched to the second display mode, thedisplay panel 100 displays the secondlight transmissive pattern 102. The secondlight source 240 emits the second light beam L2 into the secondlight guide plate 220, and the second light beam L2 is emerged from the secondlight guide plate 220 through thesecond microstructures 224 and is transmitted to thedisplay panel 100. Since the shape and position of a distributedregion 225 of thesecond microstructures 224 correspond to the secondlight transmissive pattern 102, a light shape of the second light beam L2 emitted from the secondlight guide plate 220 can be the same as the shape of the secondlight transmissive pattern 102. When the second light beam L2 is irradiated to the secondlight transmissive pattern 102, since the light shape of the second light beam L2 is the same as the shape of the secondlight transmissive pattern 102, the second light beam L2 is concentratedly irradiated on the secondlight transmissive pattern 102 to improve the brightness of the secondlight transmissive pattern 102, and the situation that the second light beam L2 is irradiated on the area of thedisplay panel 100 that is not the secondlight transmissive pattern 102 can be reduced to reduce a light leakage of the display area other than the second light transmissive pattern. - The
display device 10 further includes, for example, acontrol unit 300 electrically connected to thedisplay panel 100, the firstlight source 230, and the secondlight source 240. When switching to the first display mode, thecontrol unit 300 controls to turn on the firstlight source 230 and turn off the secondlight source 240 to irradiate the first light beam L1 to the firstlight transmissive pattern 101 through the distributedregion 215 of thefirst microstructures 214. When switching to the second display mode, thecontrol unit 300 controls to turn off the firstlight source 230 and turn on the secondlight source 240 to irradiate the second light beam L2 to the secondlight transmissive pattern 102 through the distributedregion 225 of thesecond microstructures 224. - The
display panel 100 is, for example, a liquid crystal display panel or other non-self-luminous display panel. Thedisplay panel 100 can include a plurality of display modes according to design requirements. Thedisplay panel 100 of the embodiment is exemplified by the first display mode and the second display mode, but is not limited thereto. In another embodiment, thedisplay panel 100 may also include three display modes or more, that is, the first display mode, the second display mode, and the third display mode or more. - The first
light source 230 and the secondlight source 240 are, for example, strip light sources including a plurality of point light sources, wherein the point light sources are, for example, light emitting diodes (LEDs), but not limited thereto. The firstlight source 230 and the secondlight source 240 may also be other kinds of strip light sources, such as light tubes, and the invention does not limit the type of the light source. - The
backlight module 200 further includes, for example, areflective sheet 250 disposed on a side of the secondlight guide plate 220 away from the firstlight guide plate 210 to reflect a light leaking from below the firstlight guide plate 210 and the secondlight guide plate 220 back into the firstlight guide plate 210 and the secondlight guide plate 220, thereby to improve light utilization efficiency. In addition, thebacklight module 200 may further include at least oneoptical film 260, for example, two films (optical films 261, 262). Theoptical film 260 is, for example, a diffusion film or a brightness enhancement film, and is disposed between thedisplay panel 100 and the firstlight guide plate 210 to improve the light brightness and the light uniformity of thebacklight module 200, and the like. - In the
display device 10 of the embodiment, the distributedregion 215 of thefirst microstructures 214 of the firstlight guide plate 210 corresponds to the firstlight transmissive pattern 101, and the distributedregion 225 of thesecond microstructures 224 of the secondlight guide plate 220 corresponds to the secondlight transmissive pattern 102. When the first light beam L1 is transmitted to thedisplay panel 100 through thefirst microstructures 214 in the first display mode, a brightness of the firstlight transmissive pattern 101 is improved, and a light leakage of a display area that is not the firstlight transmissive pattern 101 is reduced. When the second light beam L2 is transmitted to thedisplay panel 100 through thesecond microstructures 224 in the second display mode, a brightness of the secondlight transmissive pattern 102 is improved, and a light leakage of a display area that is not the secondlight transmissive pattern 102 is reduced. Therefore, the contrast of the image of thedisplay device 10 can be improved in both the first display mode and the second display mode, so that thebacklight module 200 of the embodiment can also exhibit a high dynamic range (HDR) effect on the display image without using dynamic local dimming. - In order to improve the contrast of the image, the quantity of types of the display modes needs to correspond to the quantity of light guide plates in the
backlight module 200. For example, thedisplay panel 100 of the embodiment includes a first display mode and a second display mode. Thebacklight module 200 includes a firstlight guide plate 210 and a secondlight guide plate 220 in a design architecture. In order to achieve a preferred display effect, thedisplay panel 100 switches only between the first display mode and the second display mode, that is, only the firstlight transmissive pattern 101 and the secondlight transmissive pattern 102 are displayed, and no other display mode is included. -
FIG. 3A andFIG. 3B are schematic diagrams showing distributions of first microstructures of another embodiment of the invention. Referring toFIG. 1 ,FIG. 3A andFIG. 3B , thefirst microstructures 214 are, for example, distributed on the firstbottom surface 213 of the firstlight guide plate 210, but are not limited thereto. Thefirst microstructures 214 may also be distributed on the firstlight exiting surface 212 of the firstlight guide plate 210a, or may be simultaneously distributed on the firstbottom surface 213 of the firstlight guide plate 210 b and the firstlight exiting surface 212 of the firstlight guide plate 210 b, as shown inFIG. 3B . Since the positions where thesecond microstructures 224 may be distributed on the secondlight guide plate 220 are the same as that of thefirst microstructures 214, it will not be described again herein. However, in one embodiment, distribution positions of thesecond microstructures 224 on the secondlight guide plate 220 and distribution positions of thefirst microstructures 214 on the firstlight guide plate 210 may be different. For example, thesecond microstructures 224 are distributed on the secondbottom surface 223, and thefirst microstructures 214 are distributed on the firstlight exiting surface 212. The distribution of thefirst microstructures 214 and thesecond microstructures 224 can be adjusted according to design requirements. -
FIG. 4 is a schematic cross-sectional view of a display device of another embodiment of the invention.FIG. 5A is a schematic diagram of a display device in a first display mode in accordance with another embodiment of the invention.FIG. 5B is a schematic diagram of a display device in a second display mode in accordance with another embodiment of the invention.FIG. 5C is a schematic diagram of a display device in a third display mode in accordance with another embodiment of the invention. Referring toFIG. 4 ,FIG. 5A ,FIG. 5B andFIG. 5C , thedisplay device 10 a of the embodiment is similar in structure and advantages to thedisplay device 10. The only difference is that thedisplay panel 100 a of the embodiment further includes a third display mode. Thedisplay panel 100 a displays a thirdlight transmissive pattern 103 in the third display mode. Thebacklight module 200 a further includes a thirdlight guide plate 270 and a thirdlight source 280. The thirdlight guide plate 270 is stacked on the firstlight guide plate 210 and the secondlight guide plate 220. In the embodiment, the firstlight guide plate 210 is, for example, disposed between the secondlight guide plate 220 and thedisplay panel 100, and the thirdlight guide plate 270 is, for example, disposed on a side of the secondlight guide plate 220 away from the firstlight guide plate 210, but is not limited thereto. The thirdlight guide plate 270 has a thirdlight incident surface 271, a thirdlight exiting surface 272 and a thirdbottom surface 273 adjacent to the thirdlight incident surface 271, and a plurality ofthird microstructures 274. The thirdlight source 280 is disposed adjacent to the thirdlight incident surface 271, and is configured to emit a third light beam L3 into the thirdlight guide plate 270, and the third light beam L3 is emerged from the thirdlight guide plate 270 through thethird microstructures 274. - The
display panel 100 a displays, for example, a thirdlight transmissive pattern 103 in the third display mode (as shown inFIG. 5C ), and the shape and position of a distributedregion 275 of thethird microstructures 274 correspond to the thirdlight transmissive pattern 103. Thethird microstructures 274 of the embodiment are, for example, distributed on the thirdbottom surface 273 of the thirdlight guide plate 270, but are not limited thereto. The positions where thethird microstructures 274 may be distributed on the thirdlight guide plate 270 are the same as that of thefirst microstructures 214 and thesecond microstructures 224 and will not be described again herein. - The third
light transmissive pattern 103 may also, for example, partially overlap with at least one of the firstlight transmissive pattern 101 and the secondlight transmissive pattern 102. When there is partial overlap, since the microstructures on the light guide plate correspond to the area of the light transmissive pattern, the distributedregion 275 of thethird microstructures 274 may also partially overlap with at least one of the distributedregion 215 of thefirst microstructures 214 and the distributedregion 225 of thesecond microstructures 224. - In the case that the
display panel 100 a further includes a third display mode, and thebacklight module 200 a further includes the thirdlight guide plate 270 and the thirdlight source 280, thecontrol unit 300 a may further be electrically connected to the thirdlight source 280. When thedisplay panel 100 a is switched to the third display mode, thecontrol unit 300 a controls to turn off the firstlight source 230 and the secondlight source 240 and turn on the thirdlight source 280. - In summary, in the display device of the embodiment of the invention, the shape and the position of the distribution region of the first microstructures of the first light guide plate correspond to the first light transmissive pattern, and the shape and the position of the distribution region of the second microstructures of the second light guide plate correspond to the second light transmissive pattern. When the first light beam is transmitted to the display panel through the first microstructures in the first display mode, a brightness of the first light transmissive pattern is improved, and a light leakage of a display area that is not the first light transmissive pattern is reduced. When the second light beam is transmitted to the display panel through the second microstructures in the second display mode, a brightness of the second light transmissive pattern is improved, and a light leakage of a display area that is not the second light transmissive pattern is reduced. Therefore, the contrast of the image of the display device can be improved in both the first display mode and the second display mode, so that the backlight module of the embodiment of the invention can also exhibit a high dynamic range effect on the display image without using dynamic local dimming.
- The foregoing description of the preferred embodiment of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form or to exemplary embodiments disclosed. Accordingly, the foregoing description should be regarded as illustrative rather than restrictive. Obviously, many modifications and variations will be apparent to practitioners skilled in this art. The embodiments are chosen and described in order to best explain the principles of the invention and its best mode practical application, thereby to enable persons skilled in the art to understand the invention for various embodiments and with various modifications as are suited to the particular use or implementation contemplated. It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents in which all terms are meant in their broadest reasonable sense unless otherwise indicated. Therefore, the term “the invention”, “The invention” or the like is not necessary limited the claim scope to a specific embodiment, and the reference to particularly preferred exemplary embodiments of the invention does not imply a limitation on the invention, and no such limitation is to be inferred. The invention is limited only by the spirit and scope of the appended claims. Moreover, these claims may refer to use “first”, “second”, etc. following with noun or element. Such terms should be understood as a nomenclature and should not be construed as giving the limitation on the number of the elements modified by such nomenclature unless specific number has been given. The abstract of the disclosure is provided to comply with the rules requiring an abstract, which will allow a searcher to quickly ascertain the subject matter of the technical disclosure of any patent issued from this disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. Any advantages and benefits described may not apply to all embodiments of the invention. It should be appreciated that variations may be made in the embodiments described by persons skilled in the art without departing from the scope of the invention as defined by the following claims. Moreover, no element and component in the disclosure is intended to be dedicated to the public regardless of whether the element or component is explicitly recited in the following claims. Furthermore, the terms such as the first display mode, the second display mode, the third display mode, the first light guide plate, the second light guide plate, the third light guide plate, the first light source, the second light source, the third light source, the first light transmissive pattern, the second light transmissive pattern, the third light transmissive pattern, the first light incident surface, the second light incident surface, the third light incident surface, the first light exiting surface, the second light exiting surface, the third light exiting surface, the first bottom surface, the second bottom surface, the third bottom surface, the first microstructures, the second microstructures, the third microstructures, the first light beam, the second light beam and the third light beam are only used for distinguishing various elements and do not limit the number of the elements.
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CN201810567451 | 2018-06-05 |
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2019
- 2019-05-31 US US16/427,360 patent/US10620364B2/en not_active Expired - Fee Related
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Cited By (9)
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US20230053738A1 (en) * | 2020-09-30 | 2023-02-23 | Sioptica Gmbh | Switchable light filter and use thereof |
JP2023515860A (en) * | 2020-09-30 | 2023-04-14 | ジオプティカ・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング | Switchable optical filters and their uses |
US11906828B2 (en) * | 2020-09-30 | 2024-02-20 | Sioptica Gmbh | Switchable light filter and use thereof |
JP7473997B2 (en) | 2020-09-30 | 2024-04-24 | ジオプティカ・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング | Switchable optical filters and their uses. |
US11460625B2 (en) | 2020-10-30 | 2022-10-04 | E Ink Holdings Inc. | Reflective display apparatus and light guide module |
US20220291543A1 (en) * | 2021-03-09 | 2022-09-15 | Sioptica Gmbh | Illumination device for a screen with at least two operating modes |
US11454841B1 (en) * | 2021-03-09 | 2022-09-27 | Sioptica Gmbh | Illumination device for a screen with at least two operating modes |
US20230130456A1 (en) * | 2021-10-25 | 2023-04-27 | Coretronic Corporation | Backlight module and display apparatus |
US11947217B2 (en) * | 2021-10-25 | 2024-04-02 | Coretronic Corporation | Backlight module and display apparatus |
Also Published As
Publication number | Publication date |
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CN110568657A (en) | 2019-12-13 |
US10620364B2 (en) | 2020-04-14 |
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